Hip to Gable Conversion — Maximising Space on Semi-Detached Properties
A hip to gable conversion replaces the sloping “hip” end of a roof with a vertical “gable” wall. This is the natural solution for semi-detached and detached houses — common across London’s Edwardian streets and 1930s suburban estates — where the hipped roof cuts significantly into the available loft space.
By squaring off the side end of the roof, you gain substantial additional floor area on the side of the loft, which can then accommodate a properly-sized bedroom, dressing room, or bathroom. A hip to gable is typically combined with a rear dormer to create maximum usable space across the full loft.
Which Homes Benefit from Hip to Gable?
Hip to gable conversions are most appropriate for:
The most common candidates. The exposed hip end can be converted to a full gable, with a window or a party wall depending on the neighbour’s property.
Both ends can be converted to gables, maximising space on both sides of the loft simultaneously.
The typical property type for hip to gable. Standard dimensions, good ridge heights, and generally good Permitted Development allowances.
Hip to Gable — FAQs
In most cases, no — it qualifies under Permitted Development. However, conservation area properties and those with Article 4 restrictions may require a full application. Our free survey confirms your specific position.
Yes, and this combination — sometimes called a ‘double loft conversion’ — is very popular. It maximises usable floor space by extending the loft both across the rear and to the side. Prime Loft prices this as a single fixed-price project.
In London, hip to gable conversions typically range from £44,000 to £72,000, depending on size, location, and whether a rear dormer is included. All Prime Loft prices are fully inclusive and fixed.
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